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valve J.

through 'passages N N'. The cylinder I is a1 'section df thepumfp-vawemrd the piston O independent of the valve G. This motion isprovided for the purpose of admit ting live steam direct from the chestto the cylinder l through one or the other of thc hollow rods P 1 andperforations ay a. It will be seen by reference to Figs. 3 and 4 thatthe ports t' and 6 communicate with the cyl'- inder I at points a shortdistance from the re spective ends of the cylinder, for the purpose ot'causing the piston 0 to run over these ports and cushion on the steamthus in closed.

Operation: When the piston in the cylinder A has moved in the directionof the pump B sufficiently far in terminating its stroke in thatdirection as to force the valve J into the position shown in Fig. l, bythe means before eX- plained, steam is then exhausted from the end ofthe cylinder I, on which rod P is situated, into the port D, and theexcess of pressure on the opposite end starts the piston in thedirection ci' port D suiiciently to close the hollow' end of rod Pagainst tace g', and open the hollow end of rod P, so as to admit livesteam, which serves tocontinue the motion of the piston, andconsequently valve G, until the flts,su"1ciently loose to permit thevalve to move its full stroke independently. This lever is secured torod Q, which projects through the chest H, and is packed by the hub sot' the lever S, which slides on a feather on the rod Q, and istightened by nut s. The lever S is designed to be operated by hand.

The watercylinder is constructed with four valve-chambers, 1, 2, 3, and4, which are all exposed by the removal of the cap T, which, as shown,embodies the air-vessel T. The cap is secured to the cylinder B by fouror more bolts.

The chambers 1 and 2 communicate with the suction-pipe U below thevalve-seats, through passage V, which nearly surrounds the pumpbarrel,and with the pump-barrel through passages 5 and 6 above its valve-seats,and with chambers 3 and 4 by passages 7 and 8 above the valve-seats, sothat these chambers receive water freely below the valve-seats from thesuction, also discharge water into the pumpcylinder and communicatewater to the cham. bers 3 and 4 from the pump-cylinder. The chambers 3and 4 merely receive water from the chambers l and 2, and the same isdischarged through the valves into the passage W, formed in the cap T,and from thence into the pipe X.

The seats 9.and 10 of the suction-valves 11 and 12 are driven snuglyinto the counterbores made to receive them, and are kept down by theskeleton rings V`Y,.against which the cap Trests. l

The seats 13 and 14 ofthe discharge-valves 15 and 16 are driven into thecounterbores shown in the drawing, and are held in place by the cap T,the holes Z, through which the valves work, being smaller than thediameter of the seats. v

The valves 15 and 16 are limited in their ascent by the shell of thespherical cavities in the cap T, and the suction-valves rise against the`joint face of the cap T. All the valves may be returned to their seatsby spiral springs,

if necessary.

The valves and seats are constructed 1n a peculiar manner, which isshown 1n Fig. 8.

The seat b has a central guide-stem, c, casty` in connection with it,which has a hole, d, formed through it. The valve b hasa hollow socket,e, closed at the upper end, in to which the guide-stem c slides snugly.

The perforation d gives a vent for the water which collects in thehollow socket e. than one valve and scat can, of course, be placed ineach of the chambers 1, 2, 3, and 4, in large pumps, if desirable.L

The piston of the water-cylinder B is ccmposed of the peculiarly-shapedheads fj" with the addition, when `leather is used, of the` i l l lwasher f.

The head f is formed with a hollow cylindrical extension, fl", and thehead jl is counterbored, as shown in position in Fig. 7, to receive it.By the simple reversal of the heads, the piston is made to receivepacking, as in Fig. 7, or cupped leathers, as in Fig. 6.

An important part of our invention, not specified in the preample ofthis specification, is in the provision of the set-screw h, which isfitted to screw, when necessary, against the solid part of the piston ofcylinder A, and firmly hold this piston,'its rod, and thepumppiston, andthus enable the pump-pistou to be packed without danger of slipping ortwisting of the pistons in the cylinders. After packing, the screw h isreleased from contact with the piston by unscrewing slightly.

We claim- 1. In connection with the valve G g g and valve J, the latteroperating by suitable connection with the engine, the supplementalcylinder I, ports i t" i 11', passages M N N', and piston O P P c c',combined and operating substantially in the manner and for the purposespeciiied.

l2. The manner of packing the shaft Q by the hub s of the hand-levers S,as and for the purpose described.

3. The seat b, having aperforated central guide-stem, c d, cast inconnection with it, in the described combination, with the valve More 'y for the purpose specified.

b, constructedwith a hollow socket, c, as and 4. The water-cylinder Band ca-p T, when constructed with chambers 1 2 3 4, which are allexposed by the removal of the cap, and Whenconnected with thesuction-pipe, pumpcylinder, and discharge-pipe, substantially in themanner described.`

5. The piston f f j, constructed substantially in the manner and` forthe purpose spec.

JAMES E. MAXWELL. EZRA coPE.

Witnesses FRANK MILLWABD, J. L. WARTMANN.

